Cve20207796 Zimbra Collaboration Suite Full __exclusive__ 【PREMIUM】

CVE-2020-7796 is a Server-Side Request Forgery (SSRF) vulnerability in the Synacor Zimbra Collaboration Suite (ZCS) that allows unauthenticated remote attackers to force the server to send HTTP requests to arbitrary internal or external destinations. Rated with a CVSS score of 9.8 , this flaw recently gained renewed attention after being added to CISA's Known Exploited Vulnerabilities (KEV) Catalog in February 2026 due to active exploitation in the wild. Technical Overview

Understanding how CVE-2020-7796 works, what components are affected, and how to successfully remediate the issue is essential for securing corporate communications. Vulnerability Overview

Zimbra allows extensions and custom handlers via Java servlets. One such servlet is the UserServlet (or ProxyServlet ), which is designed to fetch resources on behalf of a user. This servlet accepts parameters that specify the target URL or resource path. cve20207796 zimbra collaboration suite full

Attackers can leverage a leftover file, httpPost.jsp , located in the WebEx zimlet directory to proxy malicious requests through the vulnerable server. This can be used to bypass firewalls and access internal resources or sensitive data, such as LDAP credentials, that are otherwise protected. Risk and Impact Successful exploitation of this flaw can lead to:

The flaw exists because of insufficient validation of user-supplied URLs within the component. Attackers can leverage a leftover file, httpPost

CVE-2020-7796 is a vulnerability in the Synacor Zimbra Collaboration Suite (ZCS) that allows unauthenticated remote attackers to force the server to make HTTP requests to arbitrary internal or external hosts . With a CVSS score of 9.8 , this flaw poses a high risk to data confidentiality and integrity. Vulnerability Overview Vulnerability Type : Server-Side Request Forgery (SSRF).

The link is sent to a Zimbra user via email, chat, or social engineering. Attackers can leverage a leftover file

By injecting JavaScript into the user or loc parameters, an attacker can bypass Zimbra’s built-in anti-XSS filters. The injected script is then reflected back to the victim in the HTTP response without proper encoding. Because the vulnerable endpoint is accessible (due to misconfigured or default proxy routes), the attacker can force any logged-in Zimbra user to execute arbitrary JavaScript in their browser context.

: Configure your reverse proxy or front-end security handler (such as Nginx or HAProxy) to drop external traffic pointing to raw Zimlet JSP file execution tracks.